<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>

</body>
<script>
    function Student(props) {
        this.name = props.name || 'Unnamed';
    }

    Student.prototype.hello = function () {
        alert('Hello, ' + this.name + '!');
    }
    var std = new Student({name:"andy",age:12});
    console.log(Student);
    console.log(std.name);
</script>

</html>